Jig for double-sided sintering of multiple groups of copper-clad ceramic substrates
By designing fixtures with grooves, limit blocks and steps, the problem of unstable support in the sintering of copper-clad ceramic substrates is solved, and the stable positioning and horizontality of multiple sets of substrates is achieved, avoiding warping and adapting to the needs of substrates of different sizes.
Patent Information
- Application Number
- CN202421799080.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-29
- Publication Date
- 2025-08-05
- Estimated Expiration
- 2034-07-29
AI Technical Summary
Traditional fixtures cannot effectively support and maintain the level during the double-side sintering of copper-clad ceramic substrates, resulting in abnormalities such as dislocation and warping, and cannot adapt to the positioning needs of substrates of different sizes.
A fixture is designed, including a base plate and a limit block. Grooved on both sides of the base plate. The limit block is fixed by a card block. Steps are provided in the limit block for placing a copper-clad ceramic substrate. The limit block is supported at the four corners and four sides through the angle limit block and the side limit block. Combined with the design of support protrusions and card blocks, the positioning and stacking of multiple sets of substrates is realized.
The effective limit of copper-clad ceramic substrates of different sizes is achieved, avoiding slippage and warping, ensuring product level, and facilitating fixture stacking and positioning.
Smart Images
Figure CN223192106U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of copper-clad ceramic substrate production, and particularly relates to a jig for double-sided sintering of multiple groups of copper-clad ceramic substrates. Background Art
[0002] With the continuous progress of electronic technology, in the packaging applications of power electronic components, ceramic substrates not only perform functions such as electrical connection and mechanical support, but are also important channels for heat transfer. Ceramic substrates are commonly used materials in power modules, with special thermal, mechanical and electrical properties, and are ideal choices for demanding power electronics applications.
[0003] Along with the revolution and progress of global electronic technology, electronic technology is developing towards high integration and miniaturization, with higher requirements for the performance of substrates. Traditional substrates can no longer meet the requirements of high power and high heat dissipation of semiconductor modules. Copper-clad ceramic substrates (DBC substrates) have become key basic materials in power electronic devices due to their significant characteristics such as good thermal conductivity, high reliability, strong insulation, and low thermal expansion coefficient. The DBC process is the surface metallization of ceramic substrates. Specifically, copper foil is covered on the ceramic substrate and sintered at 1065 - 1083 °C. Copper and oxygen form a Cu-O eutectic liquid, and this eutectic liquid phase wets the surfaces of the copper foil and the alumina ceramic substrate, and a eutectic reaction occurs to generate composite oxides such as Cu(AlO2)2 or Cu(AlO2), realizing the bonding of the alumina ceramic substrate and the copper foil.
[0004] Direct copper-clad sintering technology performs copper-ceramic bonding at high temperature and in an atmosphere with a specific oxygen content in a sintering furnace. Since the conveying method is alloy mesh belt conveying, and it is necessary to ensure that copper and ceramics do not come into contact with the mesh belt during the process, a jig that plays a role in support and maintaining horizontal is required to effectively isolate the products and the mesh belt, and at the same time prevent abnormalities such as peeling strength and warping during the process. Currently, generally, pads with slopes are positioned on the jig bottom plate, and the contact method is line contact. When sintering both sides, it is impossible to ensure sufficient horizontality, further resulting in abnormalities such as misalignment and warping. Summary of the Utility Model
[0005] The purpose of the utility model is to provide a jig for double-sided sintering of multiple groups of copper-clad ceramic substrates, which can achieve positioning sintering of multiple copper-clad ceramic substrates with different sizes on a single bottom plate.
[0006] The above technical purpose of the utility model is achieved through the following technical solutions: A jig for double-sided sintering of multiple groups of copper-clad ceramic substrates, characterized in that it includes a bottom plate and a limiting block. A plurality of slots are evenly and arrayed at intervals on both the upper and lower surfaces of the bottom plate. Clamping blocks are provided at both the top and bottom of the limiting block, and the clamping blocks are clamped in the slots. A step is formed inside the limiting block, and the copper-clad ceramic substrate is placed on the step.
[0007] Preferably, the slotted grooves and the clamping blocks at the bottom of the limiting blocks are both cylindrical with the same specifications and are fitted in a matching manner. The radius of the cylinder is 1.5 mm and the height is 2 mm.
[0008] Preferably, the limiting blocks include corner limiting blocks and side limiting blocks. The corner limiting blocks are fitted at the four corners of the copper-clad ceramic substrate, and the side limiting blocks are arranged between two adjacent groups of corner limiting blocks and are fitted with the sides of the copper-clad ceramic substrate.
[0009] Preferably, the corner limiting block is of an L-shaped structure. At least three sets of steps are provided inside the corner limiting block from top to bottom. The heights of the two lower sets of steps are 2 mm, and the height of the upper step is 4 mm.
[0010] Preferably, the side limiting block is of a linear structure. At least three sets of steps are provided inside the side limiting block from top to bottom. The heights of the two lower sets of steps are 2 mm, and the height of the upper step is 4 mm.
[0011] Preferably, at least three sets of clamping blocks are provided at the top and bottom of the limiting block. The thicknesses of the slotted grooves and the clamping blocks are both 2 mm.
[0012] Preferably, support protrusions are provided on the steps of the corner limiting block and the side limiting block. The support protrusions are hemispherical, and the centers of the support protrusions are arranged at the centers of the front and back sides of the steps.
[0013] Preferably, at least three sets of support protrusions are provided on the straight edges of each set of steps, and each set of support protrusions is evenly spaced on the steps.
[0014] Preferably, the height of the support protrusion is 0.5 mm and the radius is 0.25 mm.
[0015] Preferably, the clamping block at the top of the limiting block is an incomplete cylinder, and the arc edge of the clamping block at the top of the limiting block is fitted and limited with the slotted groove under the bottom plate.
[0016] In summary, the utility model has the following beneficial effects:
[0017] In the utility model, by providing a plurality of slotted grooves on the fixture bottom plate, the limiting blocks are fixedly installed at any position on the fixture bottom plate through the clamping blocks, so as to meet the limiting installation of copper-clad ceramic substrates with different sizes.
[0018] In the utility model, through the corner limiting blocks and the side limiting blocks, effective limiting and supporting of the four corners and four sides of the copper-clad ceramic substrate can be realized.
[0019] The utility model can more comprehensively realize the movable limit of the copper-clad ceramic substrate after the positioning of the limit block by setting a plurality of steps, avoid horizontal slippage, and at the same time, the plane contact can better ensure the flatness of the product and prevent warping than the line contact.
[0020] The utility model is provided with clamping blocks on both the upper and lower sides of the limit block, which is convenient for the stacking of the fixture and realizes the upper and lower limit positioning. Brief Description of the Drawings
[0021] Figure 1 is the overall structural schematic diagram of the utility model;
[0022] Figure 2 is the front structural schematic diagram of the corner limit block of the utility model;
[0023] Figure 3 is the front structural schematic diagram of the side limit block of the utility model;
[0024] Figure 4 is the structural schematic diagram of the fixture stacking of the utility model. Detailed Embodiment
[0025] In order to elaborate in detail the technical solutions adopted by the utility model to achieve the predetermined technical purpose, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. And, without creative work, the technical means or technical features in the embodiments of the utility model can be replaced. The utility model will be described in detail below with reference to the drawings and in conjunction with the embodiments.
[0026] As Figures 1 to 4 shown, a fixture for double-sided sintering of multiple groups of copper-clad ceramic substrates 5 includes a bottom plate 1 and a limit block. A plurality of slots 2 are equally spaced and arrayed at intervals on both the upper and lower surfaces of the bottom plate 1. Clamping blocks 3 are provided on both the top and bottom of the limit block, and the clamping blocks 3 are clamped in the slots 2. Steps 4 are formed in the limit block, and the copper-clad ceramic substrates 5 are placed on the steps 4.
[0027] The slots 2 and the clamping blocks 3 at the bottom of the limit block are both cylindrical with the same specifications and are fitted in a matching manner. The radius of the cylinder is 1.5 mm and the height is 2 mm.
[0028] The limit block includes a corner limit block 6 and a side limit block 7. The corner limit block 6 is fitted to the four corners of the copper-clad ceramic substrate 5, and the side limit block 7 is arranged between adjacent two groups of corner limit blocks 6 and is fitted to the side of the copper-clad ceramic substrate 5.
[0029] The angular limiting block 6 is of an L-shaped structure. At least three groups of steps 4 are provided inside the angular limiting block 6 from top to bottom. The height of the two lower groups of steps 4 is 2 mm, and the height of the upper step 4 is 4 mm.
[0030] The side limiting block 7 is of a linear structure. At least three groups of steps 4 are provided in the side limiting block 7 from top to bottom. The height of the two lower groups of steps 4 is 2 mm, and the height of the upper step 4 is 4 mm.
[0031] At least three groups of clamping blocks 3 are provided at the top and bottom of the limiting block. The thicknesses of the slotted grooves 2 and the clamping blocks 3 are both 2 mm.
[0032] Support protrusions 8 are provided on the steps 4 of both the angular limiting block 6 and the side limiting block 7. The support protrusions 8 are hemispherical, and the centers of the support protrusions 8 are arranged at the centers of the front and back sides of the steps 4.
[0033] At least three groups of support protrusions 8 are provided on the straight edges of each group of steps 4, and each group of support protrusions 8 is evenly spaced and distributed on the steps 4.
[0034] The height of the support protrusions 8 is 0.5 mm, and the radius is 0.25 mm.
[0035] The clamping block 3 at the top of the limiting block is an incomplete cylinder, and the arc edge of the clamping block 3 at the top of the limiting block is fitted and limited with the slotted groove 2 below the bottom plate 1.
[0036] In this utility model, by providing multiple slotted grooves on the fixture bottom plate, the limiting block is fixedly installed at any position on the fixture bottom plate through the clamping block, so as to meet the limiting installation of copper-clad ceramic substrates of different sizes.
[0037] In this utility model, through the angular limiting block and the side limiting block, effective limiting support for the four corners and four sides of the copper-clad ceramic substrate can be achieved.
[0038] In this utility model, by providing multiple steps, after the limiting block is positioned, more comprehensive active limiting of the copper-clad ceramic substrate can be achieved, avoiding horizontal slippage. At the same time, plane contact can better ensure the flatness of the product than line contact and prevent warping.
[0039] In this utility model, by providing clamping blocks both above and below the limiting block, stacking of the fixtures is facilitated, and upper and lower limiting positioning is achieved.
[0040] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Those skilled in the art can make various modifications or equivalent replacements within the essence and protection scope of the present utility model, and such modifications or equivalent replacements should also be regarded as falling within the protection scope of the technical solution of the present utility model.
Claims
1. A jig for double-sided sintering of multiple copper-clad ceramic substrates, characterized in that: It includes a base plate and a limit block. The upper and lower surfaces of the base plate are both provided with multiple slots spaced in an array at equal intervals. The top and bottom of the limit block are both provided with a card block, which is clamped in the slot. The limit block is provided with a step, and the copper-clad ceramic substrate is placed on the step.
2. The jig for double-sided sintering of multiple copper-clad ceramic substrates according to claim 1, characterized in that: The slot and the block at the bottom of the limit block are both cylindrical and have the same specifications and fit together. The cylindrical radius is 1.5 mm and the height is 2 mm.
3. The jig for double-sided sintering of multiple copper-clad ceramic substrates according to claim 1, characterized in that: The limit blocks include corner limit blocks and side limit blocks. The corner limit blocks are fitted at the four corners of the copper-clad ceramic substrate, and the side limit blocks are arranged between two adjacent groups of corner limit blocks and fitted with the sides of the copper-clad ceramic substrate.
4. The jig for double-sided sintering of multiple copper-clad ceramic substrates according to claim 3, characterized in that: The corner limit block is an L-shaped structure, and at least three groups of steps are provided on the inner side of the corner limit block from top to bottom. The height of the two lower groups of steps is 2 mm, and the height of the upper group of steps is 4 mm.
5. The jig for double-sided sintering of multiple copper-clad ceramic substrates according to claim 4, characterized in that: The side limit block is a linear structure, and is provided with at least three groups of steps from top to bottom. The heights of the two lower groups of steps are 2 mm, and the height of the upper group of steps is 4 mm.
6. The jig for double-sided sintering of multiple copper-clad ceramic substrates according to claim 1, characterized in that: At least three groups of clamping blocks are provided on the top and bottom of the limit block, and the thickness of the slots and the clamping blocks are both 2 mm.
7. The jig for double-sided sintering of multiple copper-clad ceramic substrates according to claim 5, characterized in that: The steps of the corner limit block and the side limit block are both provided with support protrusions, the support protrusions are hemispherical, and the centers of the support protrusions are provided at the centers of the front and rear sides of the step.
8. The jig for double-sided sintering of multiple copper-clad ceramic substrates according to claim 7, characterized in that: At least three groups of supporting protrusions are provided on the straight sides of each group of steps, and the supporting protrusions of each group are distributed on the steps at equal intervals.
9. The jig for double-sided sintering of multiple copper-clad ceramic substrates according to claim 8, characterized in that: The support protrusion has a height of 0.5 mm and a radius of 0.25 mm.
10. The jig for double-sided sintering of multiple copper-clad ceramic substrates according to claim 1, characterized in that: The clamping block at the top of the limit block is in an incomplete cylindrical shape, and the arc edge of the clamping block at the top of the limit block is engaged with the slot below the bottom plate for limiting positioning.